CA1183002A - Elimination, dans des solutions de tungstate, du molybdene present a l'etat de traces - Google Patents

Elimination, dans des solutions de tungstate, du molybdene present a l'etat de traces

Info

Publication number: CA1183002A
Authority: CA; Canada
Prior art keywords: solution; sulfide; sodium tungstate; value; molybdenum
Prior art date: 1981-01-19
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

CA000394081A

Other languages

English (en)

Inventor

Dale K. Huggins

Robert C. Ziegler

Leo W. Beckstead

Paul B. Queneau

Robert F. Hogsett

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Cyprus Amax Minerals Co

Original Assignee

Amax Inc

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1981-01-19

Filing date

1982-01-13

Publication date

1985-02-26

1982-01-13 Application filed by Amax Inc filed Critical Amax Inc

1985-02-26 Application granted granted Critical

1985-02-26 Publication of CA1183002A publication Critical patent/CA1183002A/fr

Status Expired legal-status Critical Current

Links

229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 53
239000011733 molybdenum Substances 0.000 title claims abstract description 53
ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 52
PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 title abstract description 15
238000000926 separation method Methods 0.000 title abstract 2
XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 64
UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 48
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 26
TVWWSIKTCILRBF-UHFFFAOYSA-N molybdenum trisulfide Chemical compound S=[Mo](=S)=S TVWWSIKTCILRBF-UHFFFAOYSA-N 0.000 claims abstract description 25
150000004763 sulfides Chemical class 0.000 claims abstract description 11
229910052751 metal Inorganic materials 0.000 claims abstract description 8
239000002184 metal Substances 0.000 claims abstract description 8
238000000034 method Methods 0.000 claims description 54
239000000047 product Substances 0.000 claims description 18
230000020477 pH reduction Effects 0.000 claims description 15
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 13
229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 13
CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
239000012535 impurity Substances 0.000 claims description 9
239000007787 solid Substances 0.000 claims description 8
229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
239000001569 carbon dioxide Substances 0.000 claims description 6
229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
229910052979 sodium sulfide Inorganic materials 0.000 claims description 6
GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 6
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
239000002244 precipitate Substances 0.000 claims description 4
UYJXRRSPUVSSMN-UHFFFAOYSA-P ammonium sulfide Chemical compound [NH4+].[NH4+].[S-2] UYJXRRSPUVSSMN-UHFFFAOYSA-P 0.000 claims description 3
DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 claims description 3
HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 3
239000000463 material Substances 0.000 claims 4
ZOCLAPYLSUCOGI-UHFFFAOYSA-M potassium hydrosulfide Chemical compound [SH-].[K+] ZOCLAPYLSUCOGI-UHFFFAOYSA-M 0.000 claims 2
WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 10
229910052721 tungsten Inorganic materials 0.000 abstract description 9
239000010937 tungsten Substances 0.000 abstract description 9
238000000975 co-precipitation Methods 0.000 abstract 1
150000002739 metals Chemical class 0.000 abstract 1
239000000243 solution Substances 0.000 description 84
238000001556 precipitation Methods 0.000 description 14
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 10
239000003153 chemical reaction reagent Substances 0.000 description 10
150000002500 ions Chemical class 0.000 description 10
229910052708 sodium Inorganic materials 0.000 description 10
239000011734 sodium Substances 0.000 description 10
238000005188 flotation Methods 0.000 description 9
-1 molybdate ions Chemical class 0.000 description 7
MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
239000002253 acid Substances 0.000 description 6
239000007789 gas Substances 0.000 description 6
ZXOKVTWPEIAYAB-UHFFFAOYSA-N dioxido(oxo)tungsten Chemical compound [O-][W]([O-])=O ZXOKVTWPEIAYAB-UHFFFAOYSA-N 0.000 description 5
230000001590 oxidative effect Effects 0.000 description 4
239000002002 slurry Substances 0.000 description 4
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
229910052799 carbon Inorganic materials 0.000 description 3
238000006243 chemical reaction Methods 0.000 description 3
239000012141 concentrate Substances 0.000 description 3
239000012527 feed solution Substances 0.000 description 3
238000002156 mixing Methods 0.000 description 3
238000010979 pH adjustment Methods 0.000 description 3
230000001376 precipitating effect Effects 0.000 description 3
238000010791 quenching Methods 0.000 description 3
239000000377 silicon dioxide Substances 0.000 description 3
RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical compound [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 description 3
QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
229910016003 MoS3 Inorganic materials 0.000 description 2
229910019142 PO4 Inorganic materials 0.000 description 2
241001237728 Precis Species 0.000 description 2
229910052783 alkali metal Inorganic materials 0.000 description 2
238000001914 filtration Methods 0.000 description 2
XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
APVPOHHVBBYQAV-UHFFFAOYSA-N n-(4-aminophenyl)sulfonyloctadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NS(=O)(=O)C1=CC=C(N)C=C1 APVPOHHVBBYQAV-UHFFFAOYSA-N 0.000 description 2
NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
239000010452 phosphate Substances 0.000 description 2
239000002243 precursor Substances 0.000 description 2
238000011084 recovery Methods 0.000 description 2
239000011347 resin Substances 0.000 description 2
229920005989 resin Polymers 0.000 description 2
238000011282 treatment Methods 0.000 description 2
150000003658 tungsten compounds Chemical class 0.000 description 2
MBEVSMZJMIQVBG-UHFFFAOYSA-N 2-(hydroxymethyl)guanidine Chemical class NC(N)=NCO MBEVSMZJMIQVBG-UHFFFAOYSA-N 0.000 description 1
229910011255 B2O3 Inorganic materials 0.000 description 1
241000518994 Conta Species 0.000 description 1
RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
235000010678 Paulownia tomentosa Nutrition 0.000 description 1
240000002834 Paulownia tomentosa Species 0.000 description 1
239000004809 Teflon Substances 0.000 description 1
229920006362 Teflon® Polymers 0.000 description 1
LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 description 1
TVWHNULVHGKJHS-UHFFFAOYSA-N Uric acid Natural products N1C(=O)NC(=O)C2NC(=O)NC21 TVWHNULVHGKJHS-UHFFFAOYSA-N 0.000 description 1
229910052977 alkali metal sulfide Inorganic materials 0.000 description 1
150000001340 alkali metals Chemical class 0.000 description 1
229910052787 antimony Inorganic materials 0.000 description 1
WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
229910052785 arsenic Inorganic materials 0.000 description 1
RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
DQSGVVGOPRWTKI-QVFAWCHISA-N atazanavir sulfate Chemical compound [H+].[H+].[O-]S([O-])(=O)=O.C([C@H](NC(=O)[C@@H](NC(=O)OC)C(C)(C)C)[C@@H](O)CN(CC=1C=CC(=CC=1)C=1N=CC=CC=1)NC(=O)[C@@H](NC(=O)OC)C(C)(C)C)C1=CC=CC=C1 DQSGVVGOPRWTKI-QVFAWCHISA-N 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
229910052802 copper Inorganic materials 0.000 description 1
239000010949 copper Substances 0.000 description 1
238000002425 crystallisation Methods 0.000 description 1
230000008025 crystallization Effects 0.000 description 1
JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
230000029087 digestion Effects 0.000 description 1
230000000694 effects Effects 0.000 description 1
238000005485 electric heating Methods 0.000 description 1
230000008030 elimination Effects 0.000 description 1
238000003379 elimination reaction Methods 0.000 description 1
239000000706 filtrate Substances 0.000 description 1
239000010419 fine particle Substances 0.000 description 1
238000005187 foaming Methods 0.000 description 1
230000008014 freezing Effects 0.000 description 1
238000007710 freezing Methods 0.000 description 1
ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
239000011521 glass Substances 0.000 description 1
238000009854 hydrometallurgy Methods 0.000 description 1
RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
229910052757 nitrogen Inorganic materials 0.000 description 1
239000007800 oxidant agent Substances 0.000 description 1
239000002245 particle Substances 0.000 description 1
229920001343 polytetrafluoroethylene Polymers 0.000 description 1
239000004810 polytetrafluoroethylene Substances 0.000 description 1
239000011148 porous material Substances 0.000 description 1
238000011085 pressure filtration Methods 0.000 description 1
238000000746 purification Methods 0.000 description 1
230000000171 quenching effect Effects 0.000 description 1
238000010992 reflux Methods 0.000 description 1
238000000638 solvent extraction Methods 0.000 description 1
239000000126 substance Substances 0.000 description 1
239000006228 supernatant Substances 0.000 description 1
238000010408 sweeping Methods 0.000 description 1
IEDVJHCEMCRBQM-UHFFFAOYSA-N trimethoprim Chemical compound COC1=C(OC)C(OC)=CC(CC=2C(=NC(N)=NC=2)N)=C1 IEDVJHCEMCRBQM-UHFFFAOYSA-N 0.000 description 1
229940116269 uric acid Drugs 0.000 description 1
238000003828 vacuum filtration Methods 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/34—Obtaining molybdenum
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G39/00—Compounds of molybdenum
- C01G39/06—Sulfides
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G41/00—Compounds of tungsten
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/36—Obtaining tungsten

Landscapes

Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Materials Engineering (AREA)
Mechanical Engineering (AREA)
Metallurgy (AREA)
Inorganic Chemistry (AREA)
Inorganic Compounds Of Heavy Metals (AREA)

CA000394081A 1981-01-19 1982-01-13 Elimination, dans des solutions de tungstate, du molybdene present a l'etat de traces Expired CA1183002A (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US225,915		1981-01-19
US06/225,915 US4303623A (en)	1981-01-19	1981-01-19	Separation of trace molybdenum from tungstate solutions

Publications (1)

Publication Number	Publication Date
CA1183002A true CA1183002A (fr)	1985-02-26

Family

ID=22846801

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000394081A Expired CA1183002A (fr)	1981-01-19	1982-01-13	Elimination, dans des solutions de tungstate, du molybdene present a l'etat de traces

Country Status (6)

Country	Link
US (1)	US4303623A (fr)
EP (1)	EP0056714B1 (fr)
JP (1)	JPS57166315A (fr)
AT (1)	ATE22931T1 (fr)
CA (1)	CA1183002A (fr)
DE (1)	DE3273807D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4490339A (en) *	1984-02-06	1984-12-25	Amax Inc.	Process for recovering tungsten from MoS3 /WS3 precipitates
JP5553646B2 (ja) *	2009-03-02	2014-07-16	三菱マテリアル株式会社	タングステン酸アンモニウム溶液の精製方法
JP5624705B2 (ja) *	2010-02-26	2014-11-12	三菱マテリアル株式会社	タングステン酸アンモニウム溶液の製造方法
JP5538953B2 (ja) *	2010-02-26	2014-07-02	三菱マテリアル株式会社	タングステン酸ナトリウム溶液の精製方法
CN108396143B (zh) *	2018-06-07	2019-08-20	江西理工大学	一种从钨酸盐溶液萃取除钼的方法
CN108642309B (zh) *	2018-06-07	2019-08-20	江西理工大学	一种离子交换法从钨酸盐溶液除钼的工艺
CN114855000B (zh) *	2022-04-28	2023-08-22	湖北绿钨资源循环有限公司	一种钨冶炼过程中钨、钼分离除杂的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2339888A (en) *	1942-08-08	1944-01-25	Us Vanadium Corp	Recovery of molybdenum and tungsten from ores
US3158438A (en) *	1962-09-19	1964-11-24	Union Carbide Corp	Solvent extraction process for recovering tungsten values from contaminated aqueous solutions
US3173754A (en) *	1962-09-19	1965-03-16	Union Carbide Corp	Separation of molybdenum from tungsten values
US3256057A (en) *	1962-10-26	1966-06-14	Burwell Blair	Process of recovering high purity tungsten compositions from tungsten-bearing ores
AU469769B2 (en) *	1973-11-19	1976-02-26	Warman International Limited	Process forthe separation of tungsten and molybdenum
JPS5320245B2 (fr) *	1974-03-22	1978-06-26

1981
- 1981-01-19 US US06/225,915 patent/US4303623A/en not_active Expired - Fee Related
1982
- 1982-01-13 CA CA000394081A patent/CA1183002A/fr not_active Expired
- 1982-01-15 DE DE8282300211T patent/DE3273807D1/de not_active Expired
- 1982-01-15 AT AT82300211T patent/ATE22931T1/de not_active IP Right Cessation
- 1982-01-15 EP EP82300211A patent/EP0056714B1/fr not_active Expired
- 1982-01-19 JP JP57006732A patent/JPS57166315A/ja active Pending

Also Published As

Publication number	Publication date
US4303623A (en)	1981-12-01
EP0056714B1 (fr)	1986-10-15
ATE22931T1 (de)	1986-11-15
JPS57166315A (en)	1982-10-13
EP0056714A3 (en)	1982-08-11
EP0056714A2 (fr)	1982-07-28
DE3273807D1 (en)	1986-11-20

Legal Events

Date	Code	Title	Description
2002-02-26	MKEX	Expiry

Publication	Publication Date	Title
US4273745A (en)	1981-06-16	Production of molybdenum oxide from ammonium molybdate solutions
CA1096588A (fr)	1981-03-03	Recuperation du selenium
US4115110A (en)	1978-09-19	Vanadium recovery process
EP0004431A1 (fr)	1979-10-03	Lixiviation de minéraux à l'aide de bactéries
US2339888A (en)	1944-01-25	Recovery of molybdenum and tungsten from ores
US3969484A (en)	1976-07-13	Process for recovering tungsten from alkaline leaching solution of tungsten ores
US3911076A (en)	1975-10-07	Process for purifying molybdenite concentrates
US4024215A (en)	1977-05-17	Production of uranium peroxide
CA2147249A1 (fr)	1994-04-28	Methode de separation de l'antimoine
FI101289B (fi)	1998-05-29	Menetelmä kupariarsenaatin valmistamiseksi
CA1050731A (fr)	1979-03-20	Production hydrometallurgique de l'oxyde de molybdene de qualite technique a partir de concentres de molybdenite
CA1046289A (fr)	1979-01-16	Traitement hydrometallurgique des intermediaires a teneur de nickel et de cuivre
EP0056714B1 (fr)	1986-10-15	Séparation de traces de molybdène de solutions de tungstate
US4083922A (en)	1978-04-11	Process for the manufacture of ammonium and alkali metal tungstates
US4552730A (en)	1985-11-12	Recovery of titanium from perovskite using sulfuric acid leaching
US3658464A (en)	1972-04-25	Molybdenum oxide refining process
US4214896A (en)	1980-07-29	Process for producing cobalt metal powder
US3173754A (en)	1965-03-16	Separation of molybdenum from tungsten values
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CA1181240A (fr)	1985-01-22	Traitement d'une liqueur de lessivage au tungstate de sodium, contenant a l'etat dissous des impuretes de silice, phosphore et fluor
US4080421A (en)	1978-03-21	Process for preparing ammonium tungstates
US3751558A (en)	1973-08-07	Process of separating cobalt from nickel by means of ammonia
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US4083920A (en)	1978-04-11	Treatment of tri(alkaline earth metal) tungstates with acids
US4478698A (en)	1984-10-23	Process for recovering copper and molybdenum from low grade copper concentrates